Security readout for executives and security teams
Plain-English summary
IBM DataPower Gateway can mishandle HOST headers in affected releases. An attacker may be able to inject HTTP headers and use that behavior for attacks such as cross-site scripting, cache poisoning, or session hijacking. Severity is medium, but internet-facing gateway deployments can make exposure business-relevant.
Executive priority
Treat as a moderate-priority gateway hygiene issue. Prioritize internet-facing or identity-adjacent DataPower deployments because gateway flaws can affect many downstream applications even when the CVSS score is not high.
Technical view
CVE-2021-38944 is an HTTP header injection issue caused by improper HOST header input validation in IBM DataPower Gateway. The provided CVSS v3.0 score is 4.8 with network access, no privileges, no user interaction, high attack complexity, low confidentiality and integrity impact, and no availability impact.
Likely exposure
Exposure is likely limited to IBM DataPower Gateway deployments running affected 2018.4.1, 10.0.1, 10.0.2, or 10.0.3 release ranges listed in the sources. Publicly reachable gateways, API gateways, or reverse-proxy placements deserve priority review.
Exploitation context
The source bundle does not show CISA KEV listing or cited active exploitation. IBM X-Force describes possible downstream impacts, including XSS, cache poisoning, or session hijacking. Attack complexity is rated high, so exploitation may depend on deployment-specific behavior.
Researcher notes
Evidence supports HOST header input validation failure and potential HTTP header injection impacts. The bundle does not provide exploit details, observed exploitation, or exact fixed build numbers, so remediation should be validated against IBM’s advisory before closure.
Mitigation direction
- Identify all IBM DataPower Gateway versions in production and non-production environments.
- Compare deployed versions against IBM advisory and X-Force affected ranges.
- Apply IBM vendor guidance or upgrade to a fixed supported release.
- Review HOST header handling in upstream proxies, caches, and application routing.
- Monitor gateway and cache logs for anomalous HOST header patterns.
Validation and detection
- Confirm DataPower firmware versions from asset inventory or appliance management records.
- Check whether affected gateways are internet-facing or reachable by untrusted clients.
- Review change records for IBM advisory remediation after May 2022.
- Verify cache, proxy, and routing layers do not trust unvalidated HOST values.
- Confirm security monitoring covers malformed or unexpected HOST header traffic.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CVE-2021-38944 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.8 (3.0)
- Known Exploited
- No
- Published
Vector: CVSS:3.0/AV:N/C:L/A:N/I:L/UI:N/PR:N/S:U/AC:H/E:U/RC:C/RL:O
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.0/AV:N/C:L/A:N/I:L/UI:N/PR:N/S:U/AC:H/E:U/RC:C/RL:O2.22.5Primary CVE scoreVulnerability scoring details
Base CVSS 3.0 score
4.8MediumVector: CVSS:3.0/AV:N/C:L/A:N/I:L/UI:N/PR:N/S:U/AC:H/E:U/RC:C/RL:O
Source materials
- CVE List V5 sourceCVE List V5
- https://www.ibm.com/support/pages/node/6587070CVE reference · x_refsource_CONFIRM
- ibm-datapower-cve202138944-header-injection (211236)CVE reference · vdb-entry, x_refsource_XF
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.